What each term actually means
A pipeline is an inventory of live work
A pipeline is the set of deals currently open. Each one is a real thing with a name, a value, an owner, a stage and something that needs to happen next. It is measured in currency and in count, and its purpose is operational: to decide what a rep does today and what a manager should worry about this week.
A funnel is a model of attrition
A funnel describes how a population thins as it moves. Of the enquiries received, some are qualified; of those, some are quoted; of those, some close. It is measured in percentages, usually across a cohort or a period, and its purpose is diagnostic: to show where the process loses people and whether that is getting better or worse.
